Abstract
We report on lunar semidiurnal tidal signatures in several parameters of the terrestrial airglow, including OI green line emission rates, OH(3-1) emission rates, as well as OH emission altitude, atomic oxygen, and OH(3-1) rotational temperature in the mesosphere/lower thermosphere region. The parameters were retrieved from spaceborne measurements of nightglow emissions at low latitudes with the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography instrument on the Envisat satellite. The identified lunar tidal signatures in airglow emissions have amplitudes of a few percent and are highly significant statistically. Moreover, the signatures observed in the different parameters analyzed show a coherent behavior consistent with the view that they are caused by vertical motions associated with vertical transport of atomic oxygen and adiabatic cooling/heating. The observed lunar semidiurnal tidal signature in temperature is in good agreement with model simulations with the global scale wave model.
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